Looking into a new 12 si

cleanablefriend

cleanablefriend

Active Member
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Hey how are you all doing? I am looking at picking up a 2012 civic si and I had some questions about performance. I am going to be trading in my VW 08 R32 for the si for reasons of being better on gas plus I would like to have a 6MT again. As for my R I am putting down 210ish to the wheels. I haven't had her on a dyno yet but a few friends of mine with the same mods as I have are in the ball park of 210. I was wondering how much would I have to spend while staying n/a to get around 195-200 to the wheels? I also am looking into doing some autox and was wondering if anyone had any input as to weather or not the stock suspension is decent enough or if I should jump right into an aftermarket set up. Thank you for your time.
 
You would need Flashpro: $700
A down pipe: $400-$600
Exhaust: $400ish
Intake: $300ish

All of that will get you around 200whp. For good measure you would want to add an Intake Manifold, which, combined with everything else, should get you around 220whp. $200-300ish.

You will also want to take into account a tune. Either online through VitViper or a local Dyno shop.

Prices are rough estimates to the best of my memory and may vary. No fear though, others will chime in to correct me if necessary.
 
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Wow that is a lot cheaper than I expected even if they are estimates. Is it recommended to upgrade the clutch at that power or is the stock one pretty solid for that amount of power?
 
cleanablefriend said:
Wow that is a lot cheaper than I expected even if they are estimates. Is it recommended to upgrade the clutch at that power or is the stock one pretty solid for that amount of power?
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I recall reading that the clutch, injectors, and fuel pump are good up to about 300-350whp.
 
Stock clutch can handle many applications, even FI.
 
cleanablefriend said:
That is impressive, what is a common aftermarket exhaust pipe size?
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2.5", 3", 3.5", and 4"(might just be tip diameter) can be found at this point I believe. There is some speculation as to what size is best to use depending on whether or not you are going the FI route. I will let others chime in on that, though.

As Dar-Dar said, though, 3" is the most common.
 
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I don't know if I want to do F/I or not. But even with 3 inch pipes does that cause the engine to lose back pressure?
 
squiggy said:
That is largely going to depend on the exhaust chosen, other mods, and tune.
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:yeahthat:

We have a few members here running 3" exhausts on their N/A setups without having any issues.
 
Alright that makes sense. Coming from my R32 a 3 inch exhaust would cause me to lose power. This will be my second N/A car I will build up so I am still learning the ins and outs. For intakes i know sri on these cars doesn't do as much as a cai but should I be to worried about sucking up water? I live in the north east and when it rains around my town large puddles tend to build up so I'm not sure if I should worry or not.
 
cleanablefriend said:
Alright that makes sense. Coming from my R32 a 3 inch exhaust would cause me to lose power. This will be my second N/A car I will build up so I am still learning the ins and outs. For intakes i know sri on these cars doesn't do as much as a cai but should I be to worried about sucking up water? I live in the north east and when it rains around my town large puddles tend to build up so I'm not sure if I should worry or not.
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A CAI is always a judgment call on the owner based on their environment and trepidation.
 
I am just curious as to why the stock air box is run the way it is. Most air boxes i have seen point right towards the grill and not away from it.
 
I
cleanablefriend said:
Alright that makes sense. Coming from my R32 a 3 inch exhaust would cause me to lose power. This will be my second N/A car I will build up so I am still learning the ins and outs. For intakes i know sri on these cars doesn't do as much as a cai but should I be to worried about sucking up water? I live in the north east and when it rains around my town large puddles tend to build up so I'm not sure if I should worry or not.
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I'm in the northeast too and wouldn't consider a cai. The upside is minimal given all the other mods you plan on, and the downside could be catastrophic. Others may disagree.
 
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cleanablefriend said:
I am just curious as to why the stock air box is run the way it is. Most air boxes i have seen point right towards the grill and not away from it.
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Think of it as a modified CAI. It does a good job trying to pull cooler air that is not in the engine compartment.
 
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Hybrid Racing made a 3.5" cold air intake for the 8thgens. It will fit your car if you run the RBC intake manifold. This cold air intake also has a really good bypass valve that will ensure that the engine doesn't hydro lock. Hybrid Racing also tested it by submerging the filter in a bucket full of water while the car was on! The engine wasn't harmed at all.
 
If you want to get a good intake that isn't a CAI, I'd recommend the Momentum Greddy or Takeda intake.
 
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